// ----------------------
//  draw multiple curves
// ----------------------

// set window size 400x400
width =400;
height=400;

scale_x=0.5;
scale_y=0.5;

// disable clipping
clip=none;
do_background=yes;

// coordinate axes
curve_red  =255;
curve_green=255;
curve_blue =255;

curve_width=2;
curve_gamma=3;

curve=x*y;
draw_curve;

// curve no 1
do_background=no;

curve_red  =255;
curve_green=100;
curve_blue =150;

curve = y^2-x*(x+1)*(x-1);
draw_curve;

// curve no 2
curve_red  =100;
curve_green=150;
curve_blue =255;

curve = y^2-(x+0.2)*(x+0.8)*(x-0.8);
draw_curve;

// curve no 3
optimize_colors=yes;
curve_red  =150;
curve_green=255;
curve_blue =100;

curve = y^2-(x-0.2)*(x+1.2)*(x-1.2);
draw_curve;